cdm/src/main/java/ucar/ma2/ArrayChar.java
public String getString(int index) {
    Index ima = getIndex();
    return getString(ima.set(index));
  }
public String getString(int index) {
    Index ima = getIndex();
    return getString(ima.set(index));
  }
Create a String out of this rank two ArrayChar object.
This treats the ArrayChar as a 1D array of Strings.
If there is a null (0) value in the ArrayChar array, the String will end there.
The null is not returned as part of the String.

@param index index into 1D String array, must be < getShape(0).
@return String value
@throws IllegalArgumentException if rank != 2