Added 4 questions

[aarushbhutra]

101,104,108 & 129

[Shoaib19]

please add following comments on the top of each file of:

// Name: (your name)
// userName: (your github username)
// Aproach: (describe how you solved the problem)

example:

// Name: Hussain Iftikhar
// userName: hussainiftikhar542
// Aproach: First remove all the brackets from the string and then start the loop to length of string and then perform all the operation on value.