con_cat

Given two strings, append them together (known as “concatenation”) and return the result. However, if the concatenation creates a double-char, then omit one of the chars, so “abc” and “cat” yields “abcat”.

This exercise was taken from codingbat.com and has been adapted for the Python language. There are many great programming exercises there, but the majority are created for Java.

Test 1

Input:

'abc'
'cat'

Output:

'abcat'

Test 2

Input:

'dog'
'cat'

Output:

'dogcat'

Test 3

Input:

'abc'
''

Output:

'abc'

Test 4

Input:

''
'cat'

Output:

'cat'

Test 5

Input:

'pig'
'g'

Output:

'pig'

Test 6

Input:

'pig'
'doggy'

Output:

'pigdoggy'