Issue with the fork

[Memli-Sheremeti]

Errors in understanding 'fork': the parent process should never execute a command.
Otherwise, a desynchronization issue arises.

When running the test case :

./pipex infile not_a_command1 not_a_command2 outfile.

output : ppiippeexx:: ccoommmmaanndd nnoott ffoouunndd:: llooll

An issue arises in handling commands that are not valid, leading to unexpected behavior in the output.

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When running the test case :

./pipex not_a_file cmd1 cmd2 outfile.
output :

BASH :
< not_a_file cmd1 | cmd2 > outfile
output: no such file or directory: not_a_file

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When running the test case :

time ./pipex infile "'sleep 3" "sleep 1" outfile
output: /pipex infile "sleep 4" "sleep 2" outfile 0.00s user 0.00s system 0% cpu 2.004 total

BASH:
< infile sleep 4 | sleep 2 > outfile

output: sleep 4 < infile 0.00s user 0.00s system 0% cpu 4.001 total
sleep 2 > outfile 0.00s user 0.00s system 0% cpu 2.001 total