String to Integer and Vice Versa

Write two functions:

1. to_int() : A function to convert a string to an integer.
2. to_str() : A function to convert an integer to a string.

Examples

to_int("77") ➞ 77

to_int("532") ➞ 532

to_str(77) ➞ "77"

to_str(532) ➞ "532"

Notes

• Don't forget to return the result.
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