code: def center_accent(string, accent):
      """
      Returns a string with accent inserted on the middle character. Useful to
      put combining accents on symbol names, including multi-character names.
  
      Parameters
      ==========
  
      string : string
          The string to place the accent in.
      accent : string
          The combining accent to insert
  
      References
      ==========
  
      .. [1] https://en.wikipedia.org/wiki/Combining_character
      .. [2] https://en.wikipedia.org/wiki/Combining_Diacritical_Marks
  
      """
  
      # Accent is placed on the previous character, although it may not always look
      # like that depending on console
      midpoint = len(string) // 2 + 1
      firstpart = string[:midpoint]
      secondpart = string[midpoint:]
      return firstpart + accent + secondpart
  
imports: import sys
  import warnings
  from string import ascii_lowercase, ascii_uppercase
  import unicodedata
  from sympy.printing.conventions import split_super_sub
  from sympy.core.alphabets import greeks
  from sympy.utilities.exceptions import sympy_deprecation_warning
label_desc: Use image node_id 13 for calling a global function with example usage: center_accent(string, accent) and returns: unknown