Number of occurrence
Return the number of occurrence of a certain letter in the given string.
Sample Code:
def countLetters(s,letter):
# Enter your logic here...
Examples:
Input: 'Javascript','a'
Output: 2
Explanation: 2 a's to be found.
Input: 'I put the pro in procrastinate',' '
Output: 5
Explanation: 5 spaces to be found.
