PYTHON
Solution must be recursive. You are not allowed to use loops, or use the python "in" operator.
Write a function which is passed 3 parameters, all of which are strings. The function returns a copy of the string s with all occurrences of old_c replaced by new_c.
You are not allowed to use the built-in python replace method. You may assume that old_c and new_c are both strings of length 1.
def replace(s, old_c, new_c):
>>> replace('science', 'c' , 't')
'stiente'
>>> replace('python', 's', 't')
'python'
>>> replace('rocker', 'r', 'd')
'docked'