String to Integer and Vice Versa

Write two functions:

1. toInt() : A function to convert a string to an integer.
2. toStr() : A function to convert an integer to a string.

Examples

toInt("77") ➞ 77

toInt("532") ➞ 532

toStr(77) ➞ "77"

toStr(532) ➞ "532"