Solution Exercise 54: python algorithm to delete multiple spaces in string

Exercise 54

Write a python program as a function which takes as a parameter a string s and which returns another string obtained from s by removing the spaces at the beginning of the string s and the spaces at the end of the string s without using the lstrip() neither any predefined method. Exemple if

s = "     Hello    "

, the function returns the string

"Hello"

Solution

def removeSpace(s):
      n = len(s)
      
      # initializing the number of existing space at the end of s
      j = 0
      while(s[n-1-j]) == " ":
            j = j + 1
      s = s[:n-j]
      
      # initializing the number of existing space at the begining of s
      i = 0
      while s[i] == " ":
            i = i + 1
      s = s[i:]
      return s

# Testing algorithm 
s = "       Hello World           "
print("s with spaces : " ,"'"+ s +"'") # display : s with spaces :  '       Hello World           '
print("s without spaces:" ,"'"+ removeSpace(s)+"'") # display : s without spaces: 'Hello World'