code: function isCaseAcronym(testString, stringToRank, caseRank) {
    let splitValue = null
    switch (caseRank) {
      case caseRankings.SNAKE:
        splitValue = '_'
        break
      case caseRankings.KEBAB:
        splitValue = '-'
        break
      case caseRankings.PASCAL:
      case caseRankings.CAMEL:
        splitValue = /(?=[A-Z])/
        break
      default:
        splitValue = null
    }
  
    const splitTestString = testString.split(splitValue)
    return stringToRank
      .toLowerCase()
      .split('')
      .reduce((correct, char, charIndex) => {
        const splitItem = splitTestString[charIndex]
        return correct && splitItem && splitItem[0].toLowerCase() === char
      }, true)
  }
docs: Check if stringToRank is an acronym for a partial case
  @example
  // returns true
  isCaseAcronym('super_duper_file', 'sdf', caseRankings.SNAKE)
  @param {String} testString - the string to test against
  @param {String} stringToRank - the acronym to test
  @param {Number} caseRank - the ranking of the case
  @returns {Boolean} whether the stringToRank is an acronym for the testString