Add max_match

This function will be used to find eGalax drm device.

src/scripts/python/util/common.py

@@ -0,0 +1,30 @@
+"""Common Utilities"""
+
+def max_match(a: str, b: str) -> str:
+    """Maximum matching of intersection of pair of string
+
+    This function will return the intersection of two strings from the start.
+    
+    Example:
+        >>> a = "/sys/devices/folan/bahman"
+        >>> b = "/sys/devices/fol/bahman"
+        >>> max_match(a,b)
+        '/sys/dedices/fol'
+
+    Args:
+        a (str): firsrt string
+        b (str): second string
+
+    Returns:
+        str: intersection of two strings
+    """
+    i = 0
+    
+    if len(b) < len(a):
+        a, b = b, a
+    
+    for c in a:
+        if b[i] == c:
+            i += 1
+        else:
+            return a[0:i]