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+---
+arc: 0003 # Add the next sequence number
+title: ARC20_leo 
+authors: eduardo.veralli 
+discussion: https://github.com/AleoHQ/ARCs/discussions/13
+topic: Application 
+status: Draft
+created: 2022-09-21 
+---
+
+## Abstract
+
+Implementation of the 6 mandatory rules in Leo Programming Language so that they can be invoked in a Smart contract.
+
+They are: **balance_of**, **total_supply**, **approve**, **transfer_from**, **transfer**, and **allowance**.
+
+ARC20 includes 3 optional rules. They are: **decimals**, **name**, **symbol**.
+
+This is a WIP at [ARC20_leo](https://github.com/Entropy1729/ARC20_leo)
+
+## Specification
+
+### Mandatory functions
+
+#### To run *balance_of* function:
+
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[balanceof]
+owner_balance: Balance = Balance {
+    owner: aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7,
+    gates: 0u64,
+    amount: 269u64,
+    _nonce: 0group,
+};
+```
+
+`leo run balance_of`
+
+Console output
+```
+ • Executing 'arc20_leo.aleo/balance_of'...
+ • Executed 'balance_of' (in 11642 ms)
+
+➡️  Output
+
+ • 269u64
+```
+
+#### To run *total_supply* function:
+
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[total_supply]
+amount_supply: u64 = 1729u64;
+```
+
+`leo run total_supply`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/total_supply'...
+ • Executed 'total_supply' (in 5944 ms)
+
+➡️  Output
+
+ • 1729u64
+```
+
+#### To run *approve* function:
+
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[approve]
+owner: address = aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7;
+amount_owner: u64 = 164u64;
+spender: address = aleo1mgfq6g40l6zkhsm063n3uhr43qk5e0zsua5aszeq5080dsvlcvxsn0rrau;
+amount_desired: u64 = 64u64;
+```
+
+`leo run approve`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/approve'...
+ • Executed 'approve' (in 9745 ms)
+
+➡️  Output
+
+ • true
+```
+
+#### To run *transfer_from* function:
+
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[transfer_from]
+from_balance: Balance = Balance {
+    owner: aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7,
+    gates: 0u64,
+    amount: 25u64,
+    _nonce: 0group,
+};
+from: address = aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7;
+to_address: address = aleo1mgfq6g40l6zkhsm063n3uhr43qk5e0zsua5aszeq5080dsvlcvxsn0rrau;
+to_gates: u64 = 0u64;
+to_amount: u64 =  30u64;
+amount: u64 = 5u64;
+```
+`leo run transfer_from`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/transfer_from'...
+ • Executed 'transferfrom' (in 21740 ms)
+
+➡️  Outputs
+
+ • {
+  owner: aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7.private,
+  gates: 0u64.private,
+  amount: 20u64.private,
+  _nonce: 6431287615986696097612324621785026814136142669749924915411966793544219414836group.public
+}
+ • aleo1mgfq6g40l6zkhsm063n3uhr43qk5e0zsua5aszeq5080dsvlcvxsn0rrau
+ • 35u64
+ • 0u64
+```
+
+#### To run *transfer* function:
+
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[transfer]
+to_balance: Balance = Balance {
+    owner: aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7,
+    gates: 0u64,
+    amount: 25u64,
+    _nonce: 0group,
+};
+to: address = aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7;
+amount: u64 = 5u64;
+```
+
+`leo run transfer`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/transfer'...
+ • Executed 'transfer' (in 14139 ms)
+
+➡️  Output
+
+ • {
+  owner: aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7.private,
+  gates: 0u64.private,
+  amount: 30u64.private,
+  _nonce: 5223267181059685515422878880245687591758320347768724919987298470390181053809group.public
+}
+```
+
+#### To run *allowance* function:
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[allowance]
+owner: address = aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7;
+spender: address = aleo1mgfq6g40l6zkhsm063n3uhr43qk5e0zsua5aszeq5080dsvlcvxsn0rrau;
+balance_owner: Balance = Balance {
+    owner: aleo1ht2a9q0gsd38j0se4t9lsfulxgqrens2vgzgry3pkvs93xrrzu8s892zn7,
+    gates: 0u64,
+    amount: 250u64,
+    _nonce: 0group,
+};
+amount_remaining: u64 = 78u64;
+
+```
+
+`leo run allowance`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/allowance'...
+ • Executed 'allowance' (in 16274 ms)
+
+➡️  Output
+
+ • 78u64
+```
+
+###  Optional functions
+ARC20 includes 3 optional rules. They are: **decimals**, **name**, and **symbol**.
+
+#### To run *decimals* function:
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[decimals]
+quantity_decimals: u64 = 8u64;
+```
+
+`leo run decimals`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/decimals'...
+ • Executed 'decimals' (in 4244 ms)
+
+➡️  Output
+
+ • 8u64
+```
+
+#### To run *name* function:
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[name]
+is_dummmy: u64 = 0u64;
+```
+
+`leo run name`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/name'...
+ • Executed 'name' (in 6431 ms)
+
+➡️  Outputs
+
+ • 65u64
+ • 76u64
+ • 69u64
+ • 79u64
+```
+
+#### To run *symbol* function:
+Input file ARC20_leo/inputs/arc20_leo.in
+```
+[symbol]
+is_dummmy: u64 = 0u64;
+```
+
+`leo run symbol`
+
+Console output.
+```
+ • Executing 'arc20_leo.aleo/symbol'...
+ • Executed 'symbol' (in 6450 ms)
+
+➡️  Outputs
+
+ • 76u64
+ • 69u64
+ • 79u64
+```
+
+### Test Cases
+
+#### To run **Test** functions:
+In every ARC20 function the input values are declared in ```\input\arc20_leo.in```.
+
+Each Test function uses the algorithm of the original function and compares its output with the values coded into the test function.
+
+In case the comparison is successful, the Test function will return True in a boolean variable.