Resolve "Create function get_possibilities"

Closes #11

See merge request !11

# Conflicts:
#   reed_solomon.py

Resolve "Create check number error"

Closes #13

See merge request !12

Resolve "Fix the show method"

Closes #14

See merge request !13

Resolve "Remake Modular inverse"

Closes #10

See merge request !9

Resolve "Fix the show method"

Closes #8

See merge request !8

Resolve "Inverse multiplicatif"

Closes #4

See merge request !4

Resolve "Evaluate a polynom"

Closes #6

See merge request !6

Resolve "Euclide Etendu"

Closes #3

See merge request !3

Resolve "Polynom addition method"

Closes #2

See merge request !2